Effect of ZrC Modified Graphite on Structure and Properties of Low-carbon Al2O3-C Refractories.

To address the issues of reduced performance and shortened lifespan during the low-carbonizating process of Al2O3-C refractories, nano-crystalline ZrC modified graphite was prepared using Zr powder and flake graphite as raw materials, with NaCl and NaF mixed salt serving as the medium. The flake graphite was gradually replaced by ZrC modified graphite in the preparation of Al2O3-C refractories, and its impact on the material's structure and properties was investigated. The results indicate that, compared to samples with only flake graphite, the introduction of 1 mass % to 5 mass % nano-crystalline ZrC modified graphite can significantly enhance the mechanical performance of low-carbon Al2O3-C refractories. When 5 mass % ZrC modified graphite is added, the mechanical properties of the samples are optimal, with the cold modulus of rupture and elastic modulus reaching 22.5 MPa and 65.0 GPa, respectively. [ABSTRACT FROM AUTHOR]